The serve command requires to be angular project but project definition could not found

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AngularJs

angular-cli

Angular6

I have been assigned a task where I have to run ng serve command in folder.

I have following folder structure.

ProjectFolder - > ClientApp - >Src
                            -> dist
                            -> e2e

I am running this command inside ProjectFolder and I am getting this error.The serve Command requires to be angular project but project definition could not found.

Is my path is wrong? In which folder shall I run this command ? ClientApp or Src?

If I make new project and serve this ng serve,it is working.

What I have tried:

I have runned inside ProjectFolder.